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Great Western Coffee Shop > All across the Great Western territory > Across the West > 14 coach IET
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Author Topic: 14 coach IET  (Read 710 times)
JohnM
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« on: July 31, 2026, 17:53:35 »
I was looking at RTT» (Real Time Trains - website) to see which trains sped through Chippenham yesterday evening while I was waiting for my Melksham service, and spotted this:
https://www.realtimetrains.co.uk/service/gb-nr:W34637/2026-07-30

Do 14 coach IETs▸ (Intercity Express Train - replacement for HSTs (manufactured by Hitachi in Kobe, Japan)) really exist? I didn't notice that it was any longer than usual, but it was motoring.
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grahame
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« Reply #1 on: July 31, 2026, 18:56:35 »
Quote from: JohnM on July 31, 2026, 17:53:35
I was looking at RTT» (Real Time Trains - website) to see which trains sped through Chippenham yesterday evening while I was waiting for my Melksham service, and spotted this:
https://www.realtimetrains.co.uk/service/gb-nr:W34637/2026-07-30

Do 14 coach IETs▸ (Intercity Express Train - replacement for HSTs (manufactured by Hitachi in Kobe, Japan)) really exist? I didn't notice that it was any longer than usual, but it was motoring.

Platform 5 at Paddington, from where it started, won't accommodate more than 10 carriages? 
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stuving
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« Reply #2 on: July 31, 2026, 20:30:04 »
Quote from: JohnM on July 31, 2026, 17:53:35
I was looking at RTT» (Real Time Trains - website) to see which trains sped through Chippenham yesterday evening while I was waiting for my Melksham service, and spotted this:
https://www.realtimetrains.co.uk/service/gb-nr:W34637/2026-07-30

Do 14 coach IETs▸ (Intercity Express Train - replacement for HSTs (manufactured by Hitachi in Kobe, Japan)) really exist? I didn't notice that it was any longer than usual, but it was motoring.

The maximum length of an IET is 12 vehicle, a fundamental limit set in the requirement whatever the unit lengths might have been.

As I understand it, this is roughly how the allocation feature in RTT works. RTT gets train formation data from TOCs▸ (Train Operating Company) by agreement, not via any "official" NR» (Network Rail - home page) data feed. The TOCs must get the information off their own train planning systems. If a train contains two units then two allocation data items are sent. If an extra unit is coupled to lengthen a train already notified then a second allocation item is sent.

If one unit replaces another there ought to be an allocation deletion item as well as a new allocation item. But if the deletion item is missing, RTT has no way of knowing this is not two units being coupled. No doubt a check against the coupled length limits could be added, but it hasn't been (yet).
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bobm
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« Reply #3 on: July 31, 2026, 22:19:52 »
There seems to have been an issue in recent days with coach allocations.

The GWR▸ (Great Western Railway) app has variously shown 18 and 14 coach formations which have then translated to other systems.
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GBM
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« Reply #4 on: August 01, 2026, 14:38:09 »
I was caught out a few days ago by RTT» (Real Time Trains - website) showing a 5 car 175 on the Newquay branch!
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